To perform reheating and fine bubble supply using a common pump while simplifying a structure around a bathtub.

The reheating device comprises a connection unit 30 provided in the bathtub, a reheating circulation circuit having upstream and downstream ends connected to the connection unit 30, and the pump and a heat supply part provided on the midway of the reheating circulation circuit. It has an outside air supply means connected to the reheating circulation circuit on a pump suction side for supplying outside air, a branch circuit branching from the reheating circulation circuit on a pump discharge side, and a selecting means for selecting either the reheating circulation circuit or the branch circuit on the downstream side beyond a branch point, as a hot water passage. The connection unit 30 has a suction passage 51 connecting the upstream end of the reheating circulation circuit to the inside of the bathtub, a first discharge passage 52 connecting the downstream end of the reheating circulation circuit to the inside of the bathtub, and a second discharge passage 53 connecting the downstream end of the branch circuit to the inside of the bathtub. The second discharge passage includes distribution resistance parts 35h, 35i.

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